Trouble with DexCom 7 plus

Hi all I am having problems with the alarm on the device. I don't get an alarm when its time to calibrate...and most of the time it don't alarm me when its high or low it will vibrate. I have the setting on vibrate then beep.
Please tell me how to handle that....

Try contacting the company. If there is something wrong with the device, they should send you a new one, right?
I have a similar problem, but it's my fault because I let the receiver fall on the floor several times, so I suppose I broke it :(

My solution is to raise the Low alert to 100 so that even if I don't feel the first vibe, I will be at a comfortable 90 or so when I hear it. I can't tell if you understand that the Dex only beeps the 2nd time an alert triggers. The first time is vibe only. This is one of my bigger gripes about the system because I will drop another 10 points by the time I hear it go off.

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